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Keep in mind that in the row on the periodic table containing the 4s and 4p orbitals (the fourth row), the d-block begins in this row as well and is labelled differently than the s and p orbitals. The 4th row on the table goes in the order 4s, 3d, then 4p chronologically, but since 3d is located in the 4s row it must go before the 4s orbital because it starts with a lower shell number. Stay focused on the numbers preceding the orbital type instead of the exact order when you read the periodic table left to right.
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